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  1. /*
  2. * AVI decoder.
  3. * Copyright (c) 2001 Fabrice Bellard.
  4. *
  5. * This library is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU Lesser General Public
  7. * License as published by the Free Software Foundation; either
  8. * version 2 of the License, or (at your option) any later version.
  9. *
  10. * This library is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. * Lesser General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Lesser General Public
  16. * License along with this library; if not, write to the Free Software
  17. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18. */
  19. #include "avformat.h"
  20. #include "avi.h"
  21. //#define DEBUG
  22. static const struct AVI1Handler {
  23. enum CodecID vcid;
  24. enum CodecID acid;
  25. uint32_t tag;
  26. } AVI1Handlers[] = {
  27. { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'd') },
  28. { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 'h', 'd') },
  29. { CODEC_ID_DVVIDEO, CODEC_ID_DVAUDIO, MKTAG('d', 'v', 's', 'l') },
  30. /* This is supposed to be the last one */
  31. { CODEC_ID_NONE, CODEC_ID_NONE, 0 },
  32. };
  33. typedef struct AVIIndex {
  34. unsigned char tag[4];
  35. unsigned int flags, pos, len;
  36. struct AVIIndex *next;
  37. } AVIIndex;
  38. typedef struct {
  39. int64_t riff_end;
  40. int64_t movi_end;
  41. int type;
  42. uint8_t *buf;
  43. int buf_size;
  44. int stream_index;
  45. offset_t movi_list;
  46. AVIIndex *first, *last;
  47. } AVIContext;
  48. #ifdef DEBUG
  49. static void print_tag(const char *str, unsigned int tag, int size)
  50. {
  51. printf("%s: tag=%c%c%c%c size=0x%x\n",
  52. str, tag & 0xff,
  53. (tag >> 8) & 0xff,
  54. (tag >> 16) & 0xff,
  55. (tag >> 24) & 0xff,
  56. size);
  57. }
  58. #endif
  59. static int get_riff(AVIContext *avi, ByteIOContext *pb)
  60. {
  61. uint32_t tag;
  62. /* check RIFF header */
  63. tag = get_le32(pb);
  64. if (tag != MKTAG('R', 'I', 'F', 'F'))
  65. return -1;
  66. avi->riff_end = get_le32(pb); /* RIFF chunk size */
  67. avi->riff_end += url_ftell(pb); /* RIFF chunk end */
  68. tag = get_le32(pb);
  69. if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
  70. return -1;
  71. return 0;
  72. }
  73. static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
  74. {
  75. AVIContext *avi = s->priv_data;
  76. ByteIOContext *pb = &s->pb;
  77. uint32_t tag, tag1, handler;
  78. int codec_type, stream_index, frame_period, bit_rate, scale, rate;
  79. unsigned int size, nb_frames;
  80. int i, n;
  81. AVStream *st;
  82. if (get_riff(avi, pb) < 0)
  83. return -1;
  84. /* first list tag */
  85. stream_index = -1;
  86. codec_type = -1;
  87. frame_period = 0;
  88. avi->type = 2;
  89. avi->buf = av_malloc(1);
  90. if (!avi->buf)
  91. return -1;
  92. avi->buf_size = 1;
  93. for(;;) {
  94. if (url_feof(pb))
  95. goto fail;
  96. tag = get_le32(pb);
  97. size = get_le32(pb);
  98. #ifdef DEBUG
  99. print_tag("tag", tag, size);
  100. #endif
  101. switch(tag) {
  102. case MKTAG('L', 'I', 'S', 'T'):
  103. /* ignored, except when start of video packets */
  104. tag1 = get_le32(pb);
  105. #ifdef DEBUG
  106. print_tag("list", tag1, 0);
  107. #endif
  108. if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
  109. avi->movi_end = url_ftell(pb) + size - 4;
  110. #ifdef DEBUG
  111. printf("movi end=%Lx\n", avi->movi_end);
  112. #endif
  113. goto end_of_header;
  114. }
  115. break;
  116. case MKTAG('a', 'v', 'i', 'h'):
  117. /* avi header */
  118. /* using frame_period is bad idea */
  119. frame_period = get_le32(pb);
  120. bit_rate = get_le32(pb) * 8;
  121. url_fskip(pb, 4 * 4);
  122. n = get_le32(pb);
  123. for(i=0;i<n;i++) {
  124. st = av_new_stream(s, 0);
  125. if (!st)
  126. goto fail;
  127. }
  128. url_fskip(pb, size - 7 * 4);
  129. break;
  130. case MKTAG('s', 't', 'r', 'h'):
  131. /* stream header */
  132. stream_index++;
  133. tag1 = get_le32(pb);
  134. switch(tag1) {
  135. case MKTAG('i', 'a', 'v', 's'):
  136. case MKTAG('i', 'v', 'a', 's'):
  137. if (s->nb_streams != 1)
  138. goto fail;
  139. avi->type = 1;
  140. avi->stream_index = 0;
  141. case MKTAG('v', 'i', 'd', 's'):
  142. codec_type = CODEC_TYPE_VIDEO;
  143. if (stream_index >= s->nb_streams) {
  144. url_fskip(pb, size - 4);
  145. break;
  146. }
  147. st = s->streams[stream_index];
  148. handler = get_le32(pb); /* codec tag */
  149. get_le32(pb); /* flags */
  150. get_le16(pb); /* priority */
  151. get_le16(pb); /* language */
  152. get_le32(pb); /* XXX: initial frame ? */
  153. scale = get_le32(pb); /* scale */
  154. rate = get_le32(pb); /* rate */
  155. if(scale && rate){
  156. st->codec.frame_rate = rate;
  157. st->codec.frame_rate_base = scale;
  158. }else if(frame_period){
  159. st->codec.frame_rate = 1000000;
  160. st->codec.frame_rate_base = frame_period;
  161. }else{
  162. st->codec.frame_rate = 25;
  163. st->codec.frame_rate_base = 1;
  164. }
  165. get_le32(pb); /* start */
  166. nb_frames = get_le32(pb);
  167. st->start_time = 0;
  168. st->duration = (double)nb_frames *
  169. st->codec.frame_rate_base * AV_TIME_BASE /
  170. st->codec.frame_rate;
  171. if (avi->type == 1) {
  172. AVStream *st;
  173. st = av_new_stream(s, 0);
  174. if (!st)
  175. goto fail;
  176. stream_index++;
  177. for (i=0; AVI1Handlers[i].tag != 0; ++i)
  178. if (AVI1Handlers[i].tag == handler)
  179. break;
  180. if (AVI1Handlers[i].tag != 0) {
  181. s->streams[0]->codec.codec_type = CODEC_TYPE_VIDEO;
  182. s->streams[0]->codec.codec_id = AVI1Handlers[i].vcid;
  183. s->streams[1]->codec.codec_type = CODEC_TYPE_AUDIO;
  184. s->streams[1]->codec.codec_id = AVI1Handlers[i].acid;
  185. } else {
  186. goto fail;
  187. }
  188. }
  189. url_fskip(pb, size - 9 * 4);
  190. break;
  191. case MKTAG('a', 'u', 'd', 's'):
  192. {
  193. unsigned int length, rate;
  194. codec_type = CODEC_TYPE_AUDIO;
  195. if (stream_index >= s->nb_streams) {
  196. url_fskip(pb, size - 4);
  197. break;
  198. }
  199. st = s->streams[stream_index];
  200. get_le32(pb); /* tag */
  201. get_le32(pb); /* flags */
  202. get_le16(pb); /* priority */
  203. get_le16(pb); /* language */
  204. get_le32(pb); /* initial frame */
  205. get_le32(pb); /* scale */
  206. rate = get_le32(pb);
  207. get_le32(pb); /* start */
  208. length = get_le32(pb); /* length, in samples or bytes */
  209. st->start_time = 0;
  210. if (rate != 0)
  211. st->duration = (int64_t)length * AV_TIME_BASE / rate;
  212. url_fskip(pb, size - 9 * 4);
  213. }
  214. break;
  215. default:
  216. goto fail;
  217. }
  218. break;
  219. case MKTAG('s', 't', 'r', 'f'):
  220. /* stream header */
  221. if (stream_index >= s->nb_streams || avi->type == 1) {
  222. url_fskip(pb, size);
  223. } else {
  224. st = s->streams[stream_index];
  225. switch(codec_type) {
  226. case CODEC_TYPE_VIDEO:
  227. get_le32(pb); /* size */
  228. st->codec.width = get_le32(pb);
  229. st->codec.height = get_le32(pb);
  230. get_le16(pb); /* panes */
  231. st->codec.bits_per_sample= get_le16(pb); /* depth */
  232. tag1 = get_le32(pb);
  233. get_le32(pb); /* ImageSize */
  234. get_le32(pb); /* XPelsPerMeter */
  235. get_le32(pb); /* YPelsPerMeter */
  236. get_le32(pb); /* ClrUsed */
  237. get_le32(pb); /* ClrImportant */
  238. st->codec.extradata_size= size - 10*4;
  239. st->codec.extradata= av_malloc(st->codec.extradata_size);
  240. get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
  241. if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
  242. get_byte(pb);
  243. #ifdef DEBUG
  244. print_tag("video", tag1, 0);
  245. #endif
  246. st->codec.codec_type = CODEC_TYPE_VIDEO;
  247. st->codec.codec_tag = tag1;
  248. st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
  249. // url_fskip(pb, size - 5 * 4);
  250. break;
  251. case CODEC_TYPE_AUDIO:
  252. get_wav_header(pb, &st->codec, size);
  253. if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
  254. url_fskip(pb, 1);
  255. break;
  256. default:
  257. url_fskip(pb, size);
  258. break;
  259. }
  260. }
  261. break;
  262. default:
  263. /* skip tag */
  264. size += (size & 1);
  265. url_fskip(pb, size);
  266. break;
  267. }
  268. }
  269. end_of_header:
  270. /* check stream number */
  271. if (stream_index != s->nb_streams - 1) {
  272. fail:
  273. av_free(avi->buf);
  274. for(i=0;i<s->nb_streams;i++) {
  275. av_freep(&s->streams[i]->codec.extradata);
  276. av_freep(&s->streams[i]);
  277. }
  278. return -1;
  279. }
  280. return 0;
  281. }
  282. static void __destruct_pkt(struct AVPacket *pkt)
  283. {
  284. pkt->data = NULL; pkt->size = 0;
  285. return;
  286. }
  287. static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
  288. {
  289. AVIContext *avi = s->priv_data;
  290. ByteIOContext *pb = &s->pb;
  291. int n, d[8], size, i;
  292. memset(d, -1, sizeof(int)*8);
  293. if (avi->type == 1 && avi->stream_index) {
  294. /* duplicate DV packet */
  295. av_init_packet(pkt);
  296. pkt->data = avi->buf;
  297. pkt->size = avi->buf_size;
  298. pkt->destruct = __destruct_pkt;
  299. pkt->stream_index = avi->stream_index;
  300. avi->stream_index = !avi->stream_index;
  301. return 0;
  302. }
  303. for(i=url_ftell(pb); !url_feof(pb); i++) {
  304. int j;
  305. if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
  306. uint32_t tag, size, tag2;
  307. url_fskip(pb, avi->riff_end - url_ftell(pb));
  308. if (get_riff(avi, pb) < 0)
  309. return -1;
  310. tag = get_le32(pb);
  311. size = get_le32(pb);
  312. tag2 = get_le32(pb);
  313. if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
  314. avi->movi_end = url_ftell(pb) + size - 4;
  315. else
  316. return -1;
  317. }
  318. for(j=0; j<7; j++)
  319. d[j]= d[j+1];
  320. d[7]= get_byte(pb);
  321. size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
  322. //parse ix##
  323. n= (d[2] - '0') * 10 + (d[3] - '0');
  324. if( d[2] >= '0' && d[2] <= '9'
  325. && d[3] >= '0' && d[3] <= '9'
  326. && d[0] == 'i' && d[1] == 'x'
  327. && n < s->nb_streams
  328. && i + size <= avi->movi_end){
  329. url_fskip(pb, size);
  330. }
  331. //parse ##dc/##wb
  332. n= (d[0] - '0') * 10 + (d[1] - '0');
  333. if( d[0] >= '0' && d[0] <= '9'
  334. && d[1] >= '0' && d[1] <= '9'
  335. && ((d[2] == 'd' && d[3] == 'c') ||
  336. (d[2] == 'w' && d[3] == 'b') ||
  337. (d[2] == 'd' && d[3] == 'b') ||
  338. (d[2] == '_' && d[3] == '_'))
  339. && n < s->nb_streams
  340. && i + size <= avi->movi_end) {
  341. if (avi->type == 1) {
  342. uint8_t *tbuf = av_realloc(avi->buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
  343. if (!tbuf)
  344. return -1;
  345. avi->buf = tbuf;
  346. avi->buf_size = size;
  347. av_init_packet(pkt);
  348. pkt->data = avi->buf;
  349. pkt->size = avi->buf_size;
  350. pkt->destruct = __destruct_pkt;
  351. avi->stream_index = n;
  352. } else {
  353. av_new_packet(pkt, size);
  354. }
  355. get_buffer(pb, pkt->data, size);
  356. if (size & 1)
  357. get_byte(pb);
  358. pkt->stream_index = n;
  359. pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read index for that
  360. return 0;
  361. }
  362. }
  363. return -1;
  364. }
  365. static int avi_read_close(AVFormatContext *s)
  366. {
  367. int i;
  368. AVIContext *avi = s->priv_data;
  369. av_free(avi->buf);
  370. for(i=0;i<s->nb_streams;i++) {
  371. AVStream *st = s->streams[i];
  372. // av_free(st->priv_data);
  373. av_free(st->codec.extradata);
  374. }
  375. return 0;
  376. }
  377. static int avi_probe(AVProbeData *p)
  378. {
  379. /* check file header */
  380. if (p->buf_size <= 32)
  381. return 0;
  382. if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
  383. p->buf[2] == 'F' && p->buf[3] == 'F' &&
  384. p->buf[8] == 'A' && p->buf[9] == 'V' &&
  385. p->buf[10] == 'I' && p->buf[11] == ' ')
  386. return AVPROBE_SCORE_MAX;
  387. else
  388. return 0;
  389. }
  390. static AVInputFormat avi_iformat = {
  391. "avi",
  392. "avi format",
  393. sizeof(AVIContext),
  394. avi_probe,
  395. avi_read_header,
  396. avi_read_packet,
  397. avi_read_close,
  398. };
  399. int avidec_init(void)
  400. {
  401. av_register_input_format(&avi_iformat);
  402. return 0;
  403. }